Capacitive Sense

To detect a press, we want to use the capacitive sense functionality on the badge.
Type Badge.capSense(1) on the left-hand side of the IDE. You can use tab-complete
to help you. You should get a number displayed in the region of about 10,000 - this
value depends on the capacitance on that corner of the badge.

Press your finger on the corner marked 1 and try again (up arrow, then enter)
- you should see a much higher value - probably over 100,000.

We can read all 6 corners using ES6 arrow functions and map:

[1,2,3,4,5,6].map(c=>Badge.capSense(c))

Note that not all corners are identical - for instance the corner nearest the
Bluetooth module (corner 3) will probably read a bit less, because there’s less
wire.

It’s easy enough for us to just threshold the capacitance values to
return an array of boolean values. You can use up-arrow and left to
move the cursor and edit the last line (or even the mouse), but
you need to get the cursor on the end of the line before you
hit enter or it’ll create a newline rather than executing: